Actually, no, don't stick them in your pocket!
Park passes and KTTW cards can easily be damaged by scratching the magnetic strips. This happens to people all the time, but most of the time they think it's been demagnetized by a cell phone or a "magnetic personality." Sliding your pass or card in and out of your pocket a dozen times a day for park entry, room charging, and dining use is a sure way to scratch the strip - or hit it with a static charge - and cause it to malfunction.
If you want to get a lanyard for your cards before you go, you can get some of these at
WalMart for $0.97 each:
I've been using them for several years; the zipper opening is secure but easy to open, and there is enough room in the pouch for multiple KTTW cards, park passes, PhotoPass cards, and fastass slips.
Important tips:
1) KTTW cards sometimes malfunction for various reasons. Folks will give you a dozen reasons from cell phone radiation to sun spots to alien abduction, but most of these ar bunk. Scratches and static electricity are the prime culprits, IMHO, and scratches can happen any time you take the cards out to use them. However, there is also strong belief that rubbing the magnetic strips of two cards together can cause one or both to malfunction, personally, I doubt this, as the magnetic fields in a 1/4" strip of tape on a KTTW card are so weak, but to be on the safe side I always keep my cards facing the same direction so that no two strips ever rub together.
2) Keep your cards flat, dry, and clean. Dirty, scratched, or bent strips are harder for the machines to read.
3) No, don't laminate, coat, or cover the cards in any way to protect them! This will immediately make them cease to function.
4) Handle the cards mostly by the edges. The more things come into physical contact with a magnetic strip - such as your fingers - the more likely the strip is to develop scratches and cease to function.
5) Keep your cards in the same place all the time. This way, you always know where they are and don't have to hunt around for them at park turnstiles and fastpass machines, and you're less likely to lose them.
6) Take a Sharpie marker with you to WDW and mark the back of each card with a few dots or something so that you know whose card is whose. This is particularly important if you have room charging priviledges enabled on the adults' KTTW cards and not the kids', and for keeping track of ticket entitlements (i.e. how many days are left on each one) if your party ever splits up for a day to do different stuff - like if Dad and 2 kids play golf or putt-putt while Mom takes 2 kids to a park or water park for the day.